[sashal-linux-stable:queue-4.4 47/54] /tmp/userfaultfd-135315.s:1715: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts'

Wednesday, 12 August 2020

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.4
head:   813cee1479363cb63ba20209f773ce41dde02255
commit: 7300c13f15e64c60c2dad13d546b801695c7da28 [47/54] ipv4: Silence suspicious RCU
usage warning
config: x86_64-randconfig-a015-20200811 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project
30c1633386e7cfb01c0a54b31ccf4c3a3873e71b)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 7300c13f15e64c60c2dad13d546b801695c7da28
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All warnings (new ones prefixed by >>):

   In file included from mm/userfaultfd.c:11:
   In file included from include/linux/pagemap.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/uaccess.h:4:
   In file included from include/linux/sched.h:61:
   In file included from include/linux/cgroup-defs.h:16:
   include/linux/percpu-refcount.h:177:3: warning: comparison of integers of different
signs: 'unsigned long' and 'int' [-Wsign-compare]
                   this_cpu_add(*percpu_count, nr);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:526:33: note: expanded from macro 'this_cpu_add'
   #define this_cpu_add(pcp, val)          __pcpu_size_call(this_cpu_add_, pcp, val)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:397:11: note: expanded from macro
'__pcpu_size_call'
                   case 8: stem##8(variable, __VA_ARGS__);break;           \
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   <scratch space>:65:1: note: expanded from here
   this_cpu_add_8
   ^
   arch/x86/include/asm/percpu.h:478:35: note: expanded from macro
'this_cpu_add_8'
   #define this_cpu_add_8(pcp, val)                percpu_add_op((pcp), val)
                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/percpu.h:130:31: note: expanded from macro
'percpu_add_op'
                                 ((val) == 1 || (val) == -1)) ?            \
                                                 ~~~  ^  ~~
   In file included from mm/userfaultfd.c:11:
   In file included from include/linux/pagemap.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/uaccess.h:4:
   In file included from include/linux/sched.h:61:
   In file included from include/linux/cgroup-defs.h:16:
   include/linux/percpu-refcount.h:276:3: warning: comparison of integers of different
signs: 'unsigned long' and 'int' [-Wsign-compare]
                   this_cpu_sub(*percpu_count, nr);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:536:33: note: expanded from macro 'this_cpu_sub'
   #define this_cpu_sub(pcp, val)          this_cpu_add(pcp, -(typeof(pcp))(val))
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:526:33: note: expanded from macro 'this_cpu_add'
   #define this_cpu_add(pcp, val)          __pcpu_size_call(this_cpu_add_, pcp, val)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:397:11: note: expanded from macro
'__pcpu_size_call'
                   case 8: stem##8(variable, __VA_ARGS__);break;           \
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   <scratch space>:225:1: note: expanded from here
   this_cpu_add_8
   ^
   arch/x86/include/asm/percpu.h:478:35: note: expanded from macro
'this_cpu_add_8'
   #define this_cpu_add_8(pcp, val)                percpu_add_op((pcp), val)
                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/percpu.h:130:31: note: expanded from macro
'percpu_add_op'
                                 ((val) == 1 || (val) == -1)) ?            \
                                                 ~~~  ^  ~~
   In file included from mm/userfaultfd.c:11:
   In file included from include/linux/pagemap.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/uaccess.h:8:
   arch/x86/include/asm/uaccess.h:754:26: warning: comparison of integers of different
signs: 'int' and 'unsigned long' [-Wsign-compare]
           if (likely(sz < 0 || sz >= n))
                                ~~ ^  ~
   include/linux/compiler.h:181:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from mm/userfaultfd.c:11:
   In file included from include/linux/pagemap.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/uaccess.h:8:
   arch/x86/include/asm/uaccess.h:772:26: warning: comparison of integers of different
signs: 'int' and 'unsigned long' [-Wsign-compare]
           if (likely(sz < 0 || sz >= n))
                                ~~ ^  ~
   include/linux/compiler.h:181:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   4 warnings generated.
   /tmp/userfaultfd-135315.s: Assembler messages:
...
> /tmp/userfaultfd-135315.s:1715: Warning: no instruction mnemonic
suffix given and no register operands; using default for `bts' 
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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